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@LawrenceGrif
@Rollo I it looks like your assuming these cables are carrying 230v AC?
So please proceed with Caution as It can kill if not used safely!!
The first step is see if the bell system is using 230v.
Can you see and take pic of the bell sounder unit?
If not do you have a multi meter?
If so could you measure the voltage between the 2 joined Brown (Live) and 2 joined Blue (Neutral) . You will need to put your probe into the remaining hole in the connector (orange & transparent thing) .
If the system is using 230v they you need a interposing relay one who's coil is 230v/ac that would connect to the button cable & neutral and it's volt free contacts can drive the digital input on Pico.